Pure Immediate : Rendering « 3D « Java

/*
* @(#)PureImmediate.java 1.19 02/10/21 13:53:05
*
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*/import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.GraphicsConfiguration;
import javax.media.j3d.Alpha;
import javax.media.j3d.Appearance;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.Geometry;
import javax.media.j3d.GraphicsContext3D;
import javax.media.j3d.Transform3D;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.geometry.ColorCube;
import com.sun.j3d.utils.universe.SimpleUniverse;
/**
* Pure immediate mode example program. In pure immediate mode, the renderer
* must be stopped on the Canvas being rendered into. In our example, this is
* done immediately after the canvas is created. A separate thread is started up
* to do the immediate mode rendering.
*/publicclass PureImmediate extends Applet implements Runnable {
private Canvas3D canvas;
private GraphicsContext3D gc = null;
private Geometry cube = null;
private Transform3D cmt = new Transform3D();
// One rotation (2*PI radians) every 6 seconds
private Alpha rotAlpha = new Alpha(-1, 6000);
private SimpleUniverse u = null;
//
// Renders a single frame by clearing the canvas, drawing the
// geometry, and swapping the draw and display buffer.
//
publicvoid render() {
if (gc == null) {
// Set up Graphics context
gc = canvas.getGraphicsContext3D();
gc.setAppearance(new Appearance());
// Set up geometry
cube = new ColorCube(0.4).getGeometry();
}
// Compute angle of rotation based on alpha value
double angle = rotAlpha.value() * 2.0 * Math.PI;
cmt.rotY(angle);
// Render the geometry for this frame
gc.clear();
gc.setModelTransform(cmt);
gc.draw(cube);
canvas.swap();
}
//
// Run method for our immediate mode rendering thread.
//
publicvoid run() {
System.out.println("PureImmediate.run: starting main loop");
while (true) {
render();
Thread.yield();
}
}
public PureImmediate() {
}
//
// init: create the canvas, stop the renderer,
// create the universe, and start the drawing thread.
//
publicvoid init() {
setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse
.getPreferredConfiguration();
canvas = new Canvas3D(config);
canvas.stopRenderer();
add("Center", canvas);
// Create the universe and viewing branch
u = new SimpleUniverse(canvas);
// This will move the ViewPlatform back a bit so the
// objects in the scene can be viewed.
u.getViewingPlatform().setNominalViewingTransform();
// Start a new thread that will continuously render
new Thread(this).start();
}
publicvoid destroy() {
u.cleanup();
}
//
// The following allows PureImmediate to be run as an application
// as well as an applet
//
publicstaticvoid main(String[] args) {
new MainFrame(new PureImmediate(), 256, 256);
}
}